Electrode face mushrooming is the normal wear mechanism of a spot welding electrode. To slow this process or prevent excessive mushrooming one must control several factors in the welding process.
Class 3 material is a designation of the Resistannce Welding Manufacturers Alliance (RWMA). It describes a group of copper alloys with excellent strength and good electrical conductibity. Class 3 is often used to weld stainless steel, nickel alloys and other highly resistive - strong materials that require high weld forces.
Class 3 Bar Stock
Class 2 material is a designation of the Resistance Welding Manufacturers Alliance (RWMA). This is a group of copper alloys with high strength and electrical conductivity. Class 2 is the most used material in the resistance welding industry. As electrodes it is used for welding bare and coated steels.
Class 2 Bar Stock
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